LibJS: Use the rounding abstract operations from Intl.NumberFormat V3

This is an editorial change in the Temporal spec.

See: https://github.com/tc39/proposal-temporal/commit/75279e5

Co-Authored-By: Idan Horowitz <idan.horowitz@gmail.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/Userland/Libraries/LibJS/Runtime/Temporal/Instant.cpp b/Userland/Libraries/LibJS/Runtime/Temporal/Instant.cpp
index 4e3f5a2ba1..008026ea98 100644
--- a/Userland/Libraries/LibJS/Runtime/Temporal/Instant.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Temporal/Instant.cpp
@@ -196,6 +196,8 @@ BigInt* difference_instant(GlobalObject& global_object, BigInt const& nanosecond
 // 8.5.8 RoundTemporalInstant ( ns, increment, unit, roundingMode ), https://tc39.es/proposal-temporal/#sec-temporal-roundtemporalinstant
 BigInt* round_temporal_instant(GlobalObject& global_object, BigInt const& nanoseconds, u64 increment, StringView unit, StringView rounding_mode)
 {
+    auto& vm = global_object.vm();
+
     // 1. Assert: Type(ns) is BigInt.
 
     u64 increment_nanoseconds;
@@ -233,8 +235,8 @@ BigInt* round_temporal_instant(GlobalObject& global_object, BigInt const& nanose
         increment_nanoseconds = increment;
     }
 
-    // 8. Return ! RoundNumberToIncrement(ℝ(ns), incrementNs, roundingMode).
-    return round_number_to_increment(global_object, nanoseconds, increment_nanoseconds, rounding_mode);
+    // 8. Return RoundNumberToIncrement(ℝ(ns), incrementNs, roundingMode).
+    return js_bigint(vm, round_number_to_increment(nanoseconds.big_integer(), increment_nanoseconds, rounding_mode));
 }
 
 // 8.5.9 TemporalInstantToString ( instant, timeZone, precision ), https://tc39.es/proposal-temporal/#sec-temporal-temporalinstanttostring